[ExI] Fermi question, possible answer
protokol2020 at gmail.com
Sat Apr 4 16:35:24 UTC 2015
Faster rotation is a cause of warming. Please see why.
On Sat, Apr 4, 2015 at 6:09 PM, John Clark <johnkclark at gmail.com> wrote:
> On Sat, Apr 4, 2015 Tomaz Kristan <protokol2020 at gmail.com> wrote:
> > What is known as the faint sun paradox - why was so warm on Earth back
>> when our Sun was much fainter
> Even more paradoxical is that 3 billion years ago on Mars, which is
> further from that fainter sun than the Earth, it was warm enough for liquid
> water to exist on it's surface. It's odd.
>> > has a strange answer. Be cause our planet rotated faster!
> Earth once rotated in less than 6 hours but back then the moon was much
> closer and it's tidal forces slowed the rotation to 24 hours and is still
> slowing it down; but angular momentum must be conserved so as the Earth
> slows down the moon goes further away. Mars has no large moon to slow it
> down and yet strangely it has almost the same rotational period as the
> Earth. Coincidence I guess.
>> > Yes, that's right. A faster rotating planet is warmer!
> I have heard that global warming could increase the rotation of the Earth
> because water expands when it gets warmer and water would tend to move from
> the equator to the poles, but it's a very small effect, less than a millisecond;
> and the faster rotation is a effect of warming not a cause.
> John K Clark
> extropy-chat mailing list
> extropy-chat at lists.extropy.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the extropy-chat